$$d = \frac{113}{6} = 18.83\ \text{g/cm}^{3}$$

$$5 \times 4.184 = 20.92\ \text{J}$$

Question 1

Which of the following is an example of a chemical change occurring in nature?

Accepted Answer

A landslide exposing rocks to air, causing iron in the rocks to rust.

Question 2

Which statement best describes a scientific model in chemistry?

Accepted Answer

A scientific model is a tangible item, picture, or mathematical equation used to represent invisible processes.

Question 3

Which of the following is a physical property of matter?

Accepted Answer

Color of sulfur.

Question 4

A student measures the mass of a gold bar as 113 g and its volume as 6 cm$$^{3}. $$What is the density of the gold bar?

Accepted Answer

$$d = \frac{113}{6} = 18.83\ 	ext{g/cm}^{3}$$

Question 5

Which of the following best describes a homogeneous mixture?

Accepted Answer

Salt dissolved in water.

Question 6

Which SI base unit is used to measure temperature?

Accepted Answer

Kelvin (K)

Question 7

Convert 25°C (room temperature) to Kelvin using the formula $$K = ^\circ C + 273.15.$$

Accepted Answer

$$K = 25 + 273.15 = 298.15$$

Question 8

Which of the following is NOT a compound?

Accepted Answer

O$$_2 ($$oxygen gas)

Question 9

A mass of 2.61 kg is how many grams?

Accepted Answer

2,610 g

Question 10

Which of the following processes represents a physical change?

Accepted Answer

Water evaporating from a puddle.

Question 11

Which of the following is a chemical property?

Accepted Answer

Iron rusts when exposed to oxygen.

Question 12

Which of the following is true about elements?

Accepted Answer

Elements are represented by chemical symbols.

Question 13

Which of the following is the correct scientific notation for 54,700,000,000?

Accepted Answer

$$5.47 	imes 10$$^{10}$$

Question 14

Which of the following best describes kinetic energy?

Accepted Answer

Energy in motion.

Question 15

Which of the following is the correct relationship for density?

Accepted Answer

$$d = \frac{m}{V}$$

Question 16

Which of the following is a heterogeneous mixture?

Accepted Answer

Rose gold and white gold jewelry.

Question 17

Which of the following is the SI base unit for mass?

Accepted Answer

Kilogram (kg)

Question 18

Which of the following statements about heat and temperature is correct?

Accepted Answer

Heat is energy transferred from hotter objects to cooler objects.

Question 19

How many joules are in 5 calories? (Given: $$1\ 	ext{cal} = 4.184\ 	ext{J})$$

Accepted Answer

$$5 	imes 4.184 = 20.92\ 	ext{J}$$

Question 20

Which of the following is NOT a physical property?

Accepted Answer

Rusting

Introduction to Chemistry: Matter, Properties, and Measurement

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